fbsd6-ulrich.Nepustil.NET has no CNAME records.
Question and response
Question
dig fbsd6-ulrich.Nepustil.NET. NS
Answer
The response has no answer records.
Authority
nepustil.net. 5843 SOA ns1.nepustil.net. hostmaster.nepustil.net. 2026030201 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0